Updated at 2:27 p.m. Saturday: Revised to reflect the third victim has been identified.

A prominent pastor and his wife were among those who died Thursday in a Cedar Hill house fire that officials believed was intentionally set and that killed one of the couple's daughters and left a second daughter hospitalized.

Eugene Keahey, 52, died in the home, along with his wife, Deanna Wilson-Keahey, 51, and 15-year-old daughter, Camryn Keahey, friends told The Dallas Morning News.

All three died in their home in the 700 block of Lovern Street, officials said.

Police arrived at the home about 4:30 a.m. Thursday, shortly after the fire broke out, and quickly rescued two people from a second-story window.

Pastor Eugene Keahey spoke during a prayer vigil outside Mt. Zion Baptist Church in the unincorporated community of Sandbranch on Feb. 27, 2016.

(Rose Baca/Staff Photographer)

The victim who was hospitalized was one of the couple's other daughters, friends told The News.

The state fire marshal's office is helping police determine the cause of the fire, KDFW-TV (Channel 4) reported. The investigation also shifted into a criminal inquiry, after officials took samples of what were believed to be accelerants inside the home.

"They were able to collect a couple of different samples that will be submitted to DPS lab in Austin," Cedar Hill police Sgt. Chad Cooley told Channel 4.

Eugene Keahey was pastor at Mt. Zion Baptist Church in Sandbranch, a small, unincorporated community in southeastern Dallas County. In 2016, as national attention grew on the water crisis in Flint, Mich., Keahey helped bring attention to the plight in Sandbranch, where the community had gone decades without running water.

Allen first met Keahey in the late 1990s when she and her daughters moved to Dallas from Tyler. She became a member of Antioch Fellowship Missionary Baptist Church in Dallas, where Keahey was pastor of the children's church.

Keahey left Antioch around 2010 to lead the congregation in Sandbranch, Allen said. In addition to his work as a pastor, she said, the family started an organization named Project DreamHaus, which helped at-risk youth, according to the organization's Facebook page.

"They were a loving family that loved everybody, and he taught his children how to serve and give back to the community," Allen said. "If you saw him, you saw those girls helping their dad."

Dawn Miller, a Cedar Hill resident and friend of the family for 15 years, said Keahey gave selflessly with his faith on full display.

Trisha Allen (left) and Eugene Keahey

(Trisha Allen)

"We often talk about how our faith has to go beyond the four walls of our churches, and we shouldn't just be praising God on Sunday mornings, and Monday through Saturday we go on about our lives," Miller said. "He lived that. He walked out his faith."

Police don't believe an intruder set the fire, and investigators are reviewing Facebook messages posted by the pastor in recent weeks, Cooley told KXAS-TV (NBC5).

Three weeks ago, Keahey changed his Facebook cover photo to a picture with the words, "We all have secrets."

Then on Thursday, 30 minutes before the fire was reported, he posted a vague message referring to "this difficult time in my life" and ended with the phrase, "Good Night Y'all."